Piptochaetium virescens (Kunth) Parodi

Stipa virescens H.B.K. Nov. Gen. & Sp. 1: 126! 1815
Stipa caerulea Presl. Rel. Haenk. 1; 227. 1830. (Type from Mexico.)
Slipa avenacea Willd.; Steud. Nom. Bot. ed. 2. 2: 643. as synonym of 5. virescens H.B.K. 1841.
Oryzopsis PringUi Scribn.; Beal, Grasses N. Am. 2: 226. 1896. (Type from Oaxaca.) Not O.
PringUi Beal. 1890. Stipa Arsenii Hack. Repert. Sp. Nov. 8: 515. 1910. (Type from Morelia. Michoacan.j
Culms erect, glabrous, mostly 75-120 cm. tall; sheaths glabrous; ligule firm, 1-2 mm. long; blades slender and involute, rather lax, those of the innovations numerous, glabrous or scabrous, 10-40 cm. long, about 1 mm. wide when flat; panicle narrow, 10-25 cm. long, the branches slender, appressed, 1 to several at a node, bearing I to few spikelets, the shorter pedicels shcrter than the spikelets; glumes 7-8 mm. long, equal, rather broad, pale or purple, abruptly acuminate, obscurely 3-nerved; lemma dark-brown at maturity, 5-6 mm. long, the callus about 1 mm. long, densely barbed with brown hairs, the body more than I mm. broad, densely villous with brown hairs, contracted above to a very short undifferentiated neck, the summit bearing a close row of stiff erect brown hairs 0.5 mm. long; awn 1-2 cm. long, twice geniculate, twisted and scabrous-pubescent to the second bend, straight and scabrous beyond, the first segment 3-5 mm. long, the first bend often at right angles, the second segment about as long as the first.
Type locality: Central Mexico. Distribution: Open woods, central Mexico.

Piptochaetium virescens là một loài thực vật có hoa trong họ Hòa thảo. Loài này được (Humb., Bonpl. & Kunth) Parodi miêu tả khoa học đầu tiên năm 1944.